ASU's ElectroMagnetic Anechoic Chamber (EMAC) is a shielded, absorber lined room in which the conditions required for precision antenna measurements are satisfied. To greatly extend this measurement capability, the chamber includes a March Microwave Inc. compact antenna test range (CATR). Together, they provide an approximately 1.2 m (height) by 2.0 m (width) test zone consisting of high-quality illuminating fields over a broad range of frequencies.
A variety of antenna characteristics are measured in the EMAC facility. Thses include radiation patterns and absolute gain over the frequency range of 500 MHz to 18 GHz. Antenna efficiency can also be measured at these frequencies, as can phase patterns and shielding effectiveness. Since the instrumentation used in the EMAC facility is based on the HP8510C Vector Network Analyzer, measurements of return loss, input impedance, coupling from one antenna to another, etc. can be performed from 50 MHz to 20 GHz.
In addition to antenna measurements, the EMAC personnel has approximately 30 years of experience performing Radar Cross Section (RCS) measurements. One of the requirements for quasi-monostatic RCS measurements is the availability of a pair of identical horn antennas (transmit and receive) that are suitable for feeding the CATR. For this reason, the current frequency range for RCS measurements is from 4 GHz to 18 GHz.
The most commonly performed measurements are RCS pattern, RCS response versus frequency, and RCS time-domain profile. These types of measurements have been performed on a broad range of targets, from basic canonical shapes to further our understanding of fundamental scattering phenomena, to complex structures like scale model helicopters with which benchmarking studies of generalized predictions codes have been made.